My apologies if this has been described somewhere but what is MUT time?
Also, isn't 30% GC a bit high? This is something that totally
surprised me when I first saw it as my program was spending 60-70% on
GC.
Is there a good low % number that should be used as a benchmark?
Thanks, Joel
On Jan 5, 2006, at 10:01 AM, Simon Marlow wrote:
> INIT time 0.00s ( 0.00s elapsed)
> MUT time 2.48s ( 2.58s elapsed)
> GC time 1.08s ( 1.08s elapsed)
> EXIT time 0.00s ( 0.00s elapsed)
> Total time 3.56s ( 3.65s elapsed)
>> %GC time 30.3% (29.5% elapsed)
>> Alloc rate 68,007,748 bytes per MUT second
>> Productivity 69.7% of total user, 67.9% of total elapsed
>> My hypothesis is that when we give each thread its own memory
> block, all the thread stacks occupy the same cache lines and we end
> up with a lot more cache misses (notice it's the MUT time that
> increased, not the GC time).
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